Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"GARDNER FOX ARTHUR" Page 3

21.

发明授权
Switching device 失效

公开(公告)号：US2396044A

公开(公告)日：1946-03-05

申请号：US42240841

申请日：1941-12-10

Applicant: BELL TELEPHONE LABOR INC

Inventor： GARDNER FOX ARTHUR

IPC: H01P1/12 , H01P1/209 , H03C7/02

CPC classification number: H03C7/02 , H01P1/122 , H01P1/209

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